MR. C. B. CLARKE ON THE FERNS OF NORTHERN INDIA. 589 
51. PsrrorUM, Swartz. 
Stems much branched dichotomously; leaves reduced to distant minute oblong-linear 
scales. Sporangia solitary in the axils of the leaves, sessile, triquetrous oboyoid, 3-celled, 
loeulicidally dehiscent into 3 valves from the vertex. Spores oblong-ellipsoid, curved, 
with a short groove on the concave side.—Distrib. Species 2-3, in the tropical and sub- 
tropical regions of both hemispheres. 
L Ps. NUDUM, Griseb. Veg. Karaiben, 180. Fertile branches triquetrous ; sterile leaves 
... mostly solitary; sporangia with two leaves beneath.—Ps. triquetrum, Swartz, Syn. 
Fil. 187; Schk. Krypt. Gew. t. 165 5; Hk. & Bauer, Gen. Fil. t. 88; Hook. Fil. 
Exot. t. 63; Wall. Cat. 46; Griff. Ic. Pl. As. Rar. t. 118 A; Spring, Monogr. Lyco- 
pod. 269; Seem. Fl. Viti. 331; Benth. Fl. Austral. vii. 681. .Lycopodium nudum, 
Linn, Sp. Pl. 1564. .— ! 
Bengal plain from the Soonderbun to the base of the Himalaya, common; and in the 
valleys of Nepaul, ex Wailich—Distrib. South India, Malay Peninsula; and in the 
tropies of nearly the whole world. 4.4 
Plentiful among the aerial roots near the base of the stems of coco-nut-trees at Cal- 
cutta, and on many other trees. I have never seen it except as an epiphyte. 
52. Lycopopium, Linn. 
. Stems branched dichotomously; leaves many, usually in some portion of the stem 
imbricated, quaquaversal or bifarious. Sporangia solitary in the axils of the leaves, or 
collected closely into quasi-catkins, the floral leaves reduced more or less bractiform ; 
sporangia sessile, broadly lunate, 1-celled, dehiscent into 2 valves from the vertex. 
Spores, when young, collected in spheres of 3, each spore, when separated, being one 
third of a sphere cut out by two planes passing through a diameter.—Distrib. A cos- 
mopolitan genus. Species 70 (as arranged by Baker). 
* Sporangia solitary in the axils of leaves that are not reduced, scattered often through a 
considerable length of the stems, but in L. squarrosum collected towards the ends of 
the stems more or less catkin-like. Leaves quaquaversal. 
l. L. ema, Michx. Fl. Bor.-Am. ii. 284. Stems erect, short, rigid; leaves 2 in., 
linear-oblong, scarcely acute, subentire, sessile, hardly narrowed at all at the base, 
reflexed just above the base, shining, coriaceous.—Spring, Monogr. Lycopod. 37. 
L. reflecum, Schk. Krypt. Grev. t. 159. | 
Sikkim, alt. 8000-12,000 feet; Sinchul, Lachen, Yeumtong, Sir J. D. Hooker ; Is- 
lumbo, Laghep; C. B. Clarke. : | : 
Stems 2-6 in., stout, the lower leaves much reflexed; sporanges not continued to the 
summits of the branches, where the barren leaves are strictly ascending. Midrib of the 
. leaves obscure. Sporangia large. The high-level Sikkim plants are only 1} in., much 
.. Slenderer, with smaller leaves.—I had erroneously identified the North-Indian plant with 
